Deterministic inventory model for recycling system

An important new trend in supply chain management is repair, remanufacturing, recycling, or reuse of products collected from the end user after they have reached the end of their useful life. This paper deals with inventory control for a recycling system. For the system, we assume that demand is deterministic, and a fixed fraction of demands is returned and used as raw material of new products. We propose inventory policies and present procedures for determining the optimal policy parameters. Received: May 2005 / Accepted: December 2005     

对交流电源装置做试验时的节能方法

本文介绍了一种对交流电源装置作试验的方法，该方法所采用的电路主要由两变流器组成，采用该方法做试验所消耗的电能经常规的方法要少得多而且对负载的适应能力也比较强，本文中，我们采用了一个简单的控制方法及系统设计，通过对一交流调速电机驱动器的原理实验，验证了该方法的有效性。     

关于马圈4500t／d选矿厂供水方案的探讨

洛阳栾川钼业公司马圈选矿厂３０００ｔ／ｄ技改工程的实施，使马圈选矿厂的生产规模达到４５００ｔ／ｄ，生产用水出现危机。提出了解决问题的方案与建议。     

报废弹药拆卸销毁安全性探讨

报废弹药拆卸是弹药安全销毁和回收再利用的技术基础。以安全拆卸销毁弹药为目的,研究弹药拆卸的基本信息、弹药零件间的约束关系、拆卸可行性等因素对拆卸安全性的影响;从降低风险有利于物质回收再利用角度,确定弹药拆卸的可达深度;在满足安全销毁的层级停止,确定弹药零部件拆卸的顺序为优先拆卸敏感零件,其次拆卸大威力零件,最后拆卸发火电源组件的拆卸模式。     

中国再生锌工业

介绍了中国再生锌的分类、产量估算方法、再生锌回收技术,以及再生锌发展缓慢的原因,并对其发展提出建议。     

Preparation of high-impact polystyrene nanocomposites with organoclay by melt intercalation and characterization by low-field nuclear magnetic resonance

Recycled high-impact polystyrene nanocomposites with organoclay were prepared. Clay of the smectite group (montmorillonite) with two types of intercalated compounds was used (Viscogel S4 and Viscogel S7). The polymer nanocomposites were prepared by melt intercalation, applying two shear intensities in a twin screw extruder. The nanostructured materials obtained were characterized by NMR relaxometry, X-ray diffraction, thermogravimetric analysis, melt flow index and mechanical analyses. The results showed that the nanostructured materials presented a mixed intercalated/exfoliated morphology. The organophilic clay, Viscogel S7, generated polymer nanocomposites with better dispersion and distribution (at low concentrations) than those produced with the Viscogel S4. The shear rate was effective for dispersion of the nanoparticles. The materials processed at 600 rpm showed better dispersion than those processed at 450 rpm. The characterization techniques chosen were effective. They were complementary and permitted comparison among the polymer nanocomposites. The use of low-field NMR relaxometry allowed measurement of the spin–lattice relaxation time of hydrogen (T₁H), which provided more precise information on the mobility of the materials, thus complementing and explaining the results obtained by X-ray diffraction.     

电子电器产品的回收再利用及其关键技术研究

电子电器产品制造业是我国一个庞大的产业领域 ,但废旧电子电器产品的有效回收利用尚没有得到足够的重视。本文结合相关项目的研究 ,阐述了在我国这样一个人均资源占有量很低的国家 ,开展废旧电子电器产品回收利用的重要意义 ,并分析了国内外在废旧电子电器回收利用方面的现状 ;在此基础上 ,探讨了废旧电子电器产品有效回收的途径 ;指出系统地研究废旧电子电器产品的回收过程 ,不仅有利于其产业化、规模化 ,而且可以为电子电器产品的绿色设计提供丰富的数据和知识支持     

洗浴废水热量循环再利用可行性研究及应用

本文对洗浴废水热量循环再利用进行了可行性研究和实验验证,更重要的是通过洗浴废水热量循环再利用方案的推广应用,单个家庭单台电热水器年节约用电可以达到200度,按照中国电热水器保有量7000万台计算,一年节约用电140亿度,折合560万个寒庭的年用电量。     

Cyclodepolymerization as a method for the synthesis of macrocyclic oligomers

Macrocyclic oligomers (MCOs) are important as starting materials for Entropically-driven Ring-opening Polymerizations (ED-ROPs). This article reviews the preparation of MCOs by the cyclodepolymerization (CDP) of condensation polymers. Many MCOs have been prepared successfully this way and in numerous cases individual macrocycles have been isolated. This approach can provide one-step syntheses of many macrocycles. The combination of CDP plus ED-ROP is an attractive potential method for recycling (‘Ring-chain Recycling’) many condensation polymers.     

Recycling photovoltaic silicon waste for fabricating porous mullite ceramics by low-temperature reaction sintering

In this study, porous mullite ceramics with coral-like structures were fabricated at a low temperature of 900 °C by using photovoltaic silicon waste (PSW) as the silicon source directly. The effects of additive content and sintering temperature on the mullitization reaction of green bodies were studied. The results showed that ammonium molybdate tetrahydrate molybdenum (H₂₄Mo₇N₆O₂₄·4H₂O) as an additive could reduce the reaction temperature for mullitization from 1100 °C to 900 °C. The research on the influence of catalyst on material properties showed that porous mullite ceramics with a flexural strength of 52.83 MPa, a 41.78 % porosity, a sintering expansion rate of 0.49 % and an average pore size of 0.23 μm could be fabricated by introducing 7.5 % H₂₄Mo₇N₆O₂₄·4H₂O at the sintering temperature of 1000 °C. This study develops an environment-friendly recycling method of PSW and provides a new idea for the low-cost preparation of porous mullite ceramics with high purity.